1. What is the Electric Motor Torque Formula?

The electric motor torque formula calculates the rotational force produced by an electric motor based on its power output and rotational speed. Torque is a crucial parameter in motor selection and mechanical system design.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( P \) — Power (kW)
• \( N \) — Rotational speed (rpm)
• 9550 — Conversion constant (derived from unit conversions)

Explanation: The formula converts power in kilowatts and speed in revolutions per minute to torque in Newton-meters, accounting for the appropriate unit conversions.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for proper motor sizing, mechanical system design, and ensuring that the motor can provide sufficient rotational force for the intended application.

4. Using the Calculator

Tips: Enter power in kilowatts (kW) and rotational speed in revolutions per minute (rpm). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 9550 used in the formula?
A: The constant 9550 comes from unit conversions: 1 kW = 1000 W, 1 minute = 60 seconds, and the relationship between power, torque, and angular velocity.

Q2: What are typical torque values for electric motors?
A: Torque values vary significantly based on motor size and type, ranging from fractional Nm for small motors to thousands of Nm for large industrial motors.

Q3: Can this formula be used for all types of electric motors?
A: Yes, this formula applies to all electric motors when you know the mechanical power output and rotational speed, regardless of motor type (AC, DC, induction, etc.).

Q4: How does torque relate to motor performance?
A: Torque determines the motor's ability to overcome load resistance and accelerate rotating masses. Higher torque means better starting capability and load handling.

Q5: What if I have power in horsepower instead of kilowatts?
A: Convert horsepower to kilowatts first (1 hp ≈ 0.746 kW) before using the formula, or use a modified formula with the appropriate conversion factor.